Your website, primary market, the main challenge or opportunity, and the business outcome you want to improve are enough to start.
No. Describe the situation in business terms. The exact technical or strategic category can be worked out after the context is clear.
Use the form when you want to share context first. Book a consultation when a live discussion is clearly the easier way to explain the situation.
Yes. The first message only needs enough context to understand the enquiry. Additional documents, access or deeper detail can come later if they are relevant.
Yes. Those are all within the positioning of this website. You do not need to separate them into different enquiry routes.